Studies on Numerical Gas Dynamic Laser Facility

燃烧驱动CO_2气体动力学激光器由燃烧系统、气体动力学（超声速流动和振动弛豫）系统和光学（谐振腔及其子系统）系统组成。CO_2气体动力学激光器的性能取决于这些元件的特性组合，本研究建立了一个数值气体动力学激光器装置（NGDL），该装置具有计算各元件特性的数值程序。NGDL是在给定燃料和氧化剂的情况下，得出小信号增益和/或激光功率的输出，作为系统优化的工具。本研究的目的得到了满意的实现.该NGDL已应用于C_6H_6（苯）/O_2（氧）体系。阐明了各元件特性对小信号增益和激光功率的影响。这可能是可能的，最佳组合的燃料/氧化剂可以获得。3.该模型可用于对实验装置性能的预测和评价，但在建立数值计算程序、提高计算精度和精确描述物理现象等方面还有待进一步研究。

A combustion-driven CO_2 GDL (CO_2 Gas Dynamic Laser) consists of several elements of combustion system, gas-dynamics (supersonic flow and vibrational relaxation) system, and optics (resonator and its sub-system) system. Performances of CO_2 GDL is governed by combination of characteristics of these elements.This research composes a Numerical Gas Dynamic Laser Facility (NGDL) which has numerical codes for calculation of characteristics of each component. The NGDL is to draw an output of small-signal gain and/or laser power when fuel and oxidizer are given and to be used for tool for system optimization.The results are summarized as follows:1. The objectives of this research was satisfactorily accomplished.2. This NGDL has been applied to a system of C_6H_6 (Benzene)/O_2 (Oxygen). Effect of characteristics of each element on small-signal gain and laser power has been clarified. It may be possible that the optimal combination of fuel/oxidizer can be obtained.3. This NGDL can be applied for expectation and evaluation of the performance of the experimental facility.More researches are required for establishment of treatment procedure of numerical codes, improvement of computational accuracy and exact description of physical phenomena of GDL.